diff --git a/src/browserbox.js b/src/browserbox.js
index 666521fd..8b90f0b3 100644
--- a/src/browserbox.js
+++ b/src/browserbox.js
@@ -672,7 +672,7 @@
                     if (!item || !item.attributes || item.attributes.length < 3) {
                         return;
                     }
-                    var branch = this._ensurePath(tree, (item.attributes[2].value || '').toString(), (item.attributes[1].value).toString());
+                    var branch = this._ensurePath(tree, (item.attributes[2].value || '').toString(), (item.attributes[1] ? item.attributes[1].value : '/').toString());
                     [].concat(item.attributes[0] || []).map(function(flag) {
                         flag = (flag.value || '').toString();
                         if (!branch.flags || branch.flags.indexOf(flag) < 0) {
diff --git a/test/unit/browserbox-test.js b/test/unit/browserbox-test.js
index e32db64d..bbc924da 100644
--- a/test/unit/browserbox-test.js
+++ b/test/unit/browserbox-test.js
@@ -518,7 +518,9 @@
                         });
                         callback(null, {
                             payload: {
-                                LSUB: [false]
+                                LSUB: [
+                                    imapHandler.parser('* LSUB (\\NoInferiors) NIL "INBOX"')
+                                ]
                             }
                         }, function() {
                             done();